EP1789305A1 - Systeme de direction automobile - Google Patents

Systeme de direction automobile

Info

Publication number
EP1789305A1
EP1789305A1 EP05782616A EP05782616A EP1789305A1 EP 1789305 A1 EP1789305 A1 EP 1789305A1 EP 05782616 A EP05782616 A EP 05782616A EP 05782616 A EP05782616 A EP 05782616A EP 1789305 A1 EP1789305 A1 EP 1789305A1
Authority
EP
European Patent Office
Prior art keywords
rod
steering
gear
working
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05782616A
Other languages
German (de)
English (en)
Other versions
EP1789305B1 (fr
Inventor
Thomas BÜTSCHI
Lorenz Zellweger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cygnus AG
Original Assignee
Cygnus AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cygnus AG filed Critical Cygnus AG
Priority to EP05782616A priority Critical patent/EP1789305B1/fr
Publication of EP1789305A1 publication Critical patent/EP1789305A1/fr
Application granted granted Critical
Publication of EP1789305B1 publication Critical patent/EP1789305B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/20—Links, e.g. track rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/008—Changing the transfer ratio between the steering wheel and the steering gear by variable supply of energy, e.g. by using a superposition gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed

Definitions

  • the present invention relates to a vehicle steering system with variablefully ⁇ ratio for a provided with at least one steerable wheel vehicle, with a steering rod, which has at least one control rod and a working rod, and provided with an actuator superposition gearbox, which between the control rod and the Working rod acts, the control rod is displaceable in the control rod longitudinal direction under the influence of a steering shaft and a steering gear, the working rod under the influence of the sliding movement of the control rod and one of these displacement movement by means of the superposition gear superimposed, initiated by its actuator th relative sliding movement between the control rod and the working rod is displaceable in working rod longitudinal direction, and wherein the sliding movement of the working rod is transmitted over a lot of the steering linkage to the steerable wheel to steer this, the practice rlagerungsgetriebe a spindle and a cooperating with this in the manner of a spindle-nut drive nut comprises.
  • State of the art State of the art
  • a steering handle eg, a steering wheel or a handlebar
  • the steering movements initiated by the driver on a steering handle are forwarded to the steerable vehicle wheels via a steering spindle, a steering gear, and a steering linkage.
  • a total rotational movement of the steering handwheel has been converted by a rotational angle into a pivoting movement of the steered wheels by a swivel angle dß by the vehicle steering system.
  • the transmission ratio of the steering (ie the ratio between the rotational movement of the steering wheel and the pivoting movement of the steered wheels) is usually considered to be constant in the case of conventional vehicle steering systems, although, strictly speaking, a slight change in the transmission ratio also occurs here even at large pivoting angles , which is due to the geometry of the steering linkage. Despite these minor non-linearities, in the case of conventional vehicle steering systems, a linear relationship between the angle of rotation da the steering handle and the swivel angle d ⁇ of the steered wheels is used.
  • EP 0 915 003 A1 (Wandfluh AG) describes a vehicle steering system with a variable transmission ratio, which is provided with a mechanical steering gear which has a high degree of non-linearity between the movements at the transmission input and the movements at the transmission output.
  • this steering system it is true that due to the special steering gear, a variable transmission ratio with a comparatively large difference between the maximum and the minimum transmission ratio is realized. Since, however, analogous to conventional steering systems with a constant transmission ratio, there is still a forced coupling between the steering handle and the brake lever. steered wheels, the variation possibilities for influencing the translation ratio are limited.
  • DE 102 16 130 A1 proposes a vehicle steering system with a variable transmission ratio, which has an overlay transmission on each side of the steering gear of a rack-and-pinion steering between the steering gear and the two steered wheels.
  • the two superimposition gears each couple the toothed rack in the region of its two longitudinal ends to a track rod arranged coaxially with the toothed rack, wherein each of the two superposition drives the toothed rack sliding movement in the rod longitudinal direction caused by the steering spindle and the rack gear each for a further sliding movement in bars Superposed longitudinal direction.
  • the superimposed gears comprise internal spindles formed on the toothed rack, control sleeves which interact with the latter and are connected to the track via an axial joint, as well as rotatable housing parts.
  • the latter each have a curved path with which a pin formed on the control sleeve is combined. acts, so that by a rotation of the housing parts relative to the control sleeves Ab ⁇ the states between the tooth and control rod can be influenced.
  • the rotational movements are effected by actuators which act on levers attached to the housings on the outside.
  • the object of the invention is to show a new concept for a vehicle transmission with variable transmission ratio which is associated with the technical field mentioned at the outset.
  • a first gear part (base part) of a pair of gear parts formed from the spindle (threaded spindle) and the nut is firmly connected to a first rod of a pair of rods formed from the control rod and the working rod, ie the first gear part is non-rotatable and immovable concerning the first rod.
  • the spindle can even be formed as an integral part of the first rod.
  • the second gear part of the pair of gear parts is rotatably mounted with respect to the second rod of the rod pair on the second rod, that is, the second gear part is to a rotation axis parallel to the rod longitudinal direction of the second rod axis of rotation, but in the longitudinal direction rod of the second rod substantially immovable.
  • the actuator is finally designed and arranged so that it can drive the second gear part for rotation with respect to the second rod.
  • the two gear parts are displaced relative to one another in the spindle longitudinal direction.
  • a rectilinear relative displacement movement of the first gear part (base part) and thus of the first rod in the longitudinal direction of the second rod can thus be generated.
  • the second gear part can be driven about its axis of rotation
  • the superposition gear can be made compact and with ein ⁇ times mechanics.
  • the transmission is thus structurally simple and therefore inexpensive and less error prone.
  • the spindle-nut drive of the actuator is advantageously designed as a self-locking Kugelum ⁇ run, d. H. the nut is a recirculating ball bearing, and the spindle is a ball screw.
  • an electric motor is advantageously used for driving the second gear part.
  • a hydraulic drive can be used for example.
  • the control rod can z. Example, be connected to a steering gear of the vehicle steering rod, in particular the rack of a rack-and-pinion steering gear or a rod firmly connected to this.
  • the working rod can z. B. be a tie rod or a solidly connected to this rod.
  • the superposition gear is preferably designed and arranged such that in the case of failure of the actuator, this is blocked and then the control rod via the superposition gear is immovably connected to the working rod. As a result, the safety of the inventive vehicle steering is improved in case of failure.
  • the first gear part of the gear part pair is the nut, and the first rod of the rod pair is the control rod.
  • the nut is thus firmly attached to the control rod, while
  • the spindle interacting with the nut is rotatably arranged on the control rod and can be driven by means of the actuator for rotation about its axis of rotation.
  • This arrangement is structurally simple and space-saving; the mother can also be trained as an integral part of the control rod, z. B. by the latter a frontal axial bore for receiving the spindle is formed.
  • the nut may be attached to the work rod while the spindle is connected to the control rod.
  • Other embodiments can also be implemented, with one of the gear parts in each case being rotatable (but axially immovable) relative to the associated rod, while the other is fixedly connected to its associated rod (that is, rotationally fixed and axially immovable).
  • the drive interacts with the rotatable transmission part. It is thus also conceivable, in particular, to rotatably couple the nut to the associated rod, while the spindle is connected in a rotationally fixed manner to the other rod.
  • control rod forms the rack of a steering gear, as is conventional
  • the first gear part may be formed by a nut, which is formed as an integral part of the rack.
  • the rack of the steering gear may have a regular toothing to form a steering gear with a constant gear ratio.
  • a toothed rack may also be used whose toothing is manufactured with a different modulus and pressure angle in order to form a steering gear with a variable transmission ratio.
  • the working rod has a cavity in which the control rod is arranged.
  • the axes of the working and the control rod can coincide or parallel, but be slightly offset to each other. As a result, the space requirement of the superposition gear and the steering can be minimized overall.
  • the jacket of the working rod has a through opening through which the steering gear can interact with the control rod received in the working rod.
  • the interaction with a conventional steering gear is made possible in a structurally simple manner.
  • the actuator is located directly in the cavity of the working rod.
  • the necessary additional installation space for the superposition gearing is thus so small that the inventive steering can be installed or retrofitted in most vehicle models without any adjustments.
  • the integrated solution also simplifies installation: for example, it may be sufficient (from a mechanical point of view) to replace the existing tie rod with the inventive drive rod with integrated actuators.
  • the operating noise of the actuator is greatly attenuated by the arrangement within the working rod, so that it is not or barely audible even with very quiet vehicle engines and without additional sound insulation measures in faux ⁇ interior.
  • An installed within the working rod actuator advantageously includes a high-pole AC electric motor.
  • a high-pole AC electric motor has 8 pairs of poles (ie 16 poles) or more, allowing low rotational speeds and high torque without the use of an additional gearbox.
  • Suitable such motors which require a small installation space and otherwise meet the requirements and are thus preferably used within the scope of the invention, are known from DE 102 40 704 A1 (Tirron Elektronik GmbH). These are high-voltage alternating current machines with a stator and a rotor fitted with permanent magnets.
  • a ferrite core is provided, which consists of two ferrite core shells and which contains a central bobbin with one or more windings.
  • the axis of the bobbin coincides with the shaft axis of a rotor shaft of the rotor. Outside the bobbin, a number of ferrite poles are formed by grinding.
  • the rotor separated from the stator by an air gap comprises a doubly high number of permanent magnets and the Rotor shaft, a rotor disk, a rotor sleeve and a permanent magnet retaining ring for the permanent magnets.
  • the permanent magnets each have an alternating north and south polarization in the axial direction. The same arrangement is constructed axially adjacent to each other for several phases with a common rotor shaft.
  • the ferrite poles of the individual phases are compared to the permanent magnet poles tangentially divided by a pole pitch divided by the number of phases, so that together with the phase position of the current results in a certain direction of rotation.
  • a motor suitable for passenger cars can be manufactured, for example, with an outside diameter of only 22 mm.
  • a motor mount is advantageously arranged in the working rod, in or on which the actuator can be attached, wherein the motor mount is formed elastically. This can be achieved by the manufacture of the motor mount of an elastic material or with sections of an elastic material or by providing the motor mount with spring means.
  • the rotary drive may also comprise a drive motor spaced apart from the second gear part and a rotary drive gear, the drive motor being coupled via the rotary drive gear to the second gear part to drive it for rotation with respect to the second rod.
  • the drive motor may be attached to the first gear part (base part) or to any other part of the vehicle steering or the vehicle.
  • the rotary drive gear can z. B. a toothed belt, which is driven by the drive motor and drives the nut for rotation about its axis of rotation.
  • the rotary drive transmission may also comprise a gear transmission, a chain transmission or any other drive gear which is suitable for connecting the second gear part of the spindle drive.
  • Driving nut shoots for rotation about its axis of rotation.
  • the distanced drive motor is subject to lower requirements on the size, can be easily supplied with energy and is easier to cool.
  • additional space is required for the detached motor and the transmission to the second gear part and the installation of the steering can be (especially with conversions) a little more complex than integrated solutions.
  • the working rod is arranged offset at a distance transversely to the control rod longitudinal direction of the control rod (respectively transversely to the control rod or its extension), in particular the working and the control rod are offset from each other side by side.
  • the working and the control rod are offset from each other side by side.
  • less space is required in the area of the control rod.
  • This installation space can then be used for other components of the vehicle steering and / or the vehicle.
  • this solution provides other freedoms in the realization of various constructive solutions in the control rod.
  • an at least partial decoupling of the control rod is achieved by the working rod by the transversely staggered arrangement.
  • control rod and the working rod parallel to each other (and offset from one another transversely to their longitudinal direction).
  • the construction of the inventive vehicle steering is simplified.
  • the superposition gear and the steering linkage are formed such that predetermined by a rotational position of the steering shaft steering angle by operating the actuator for two steerable wheels in the same manner as in a change of Rotational position can be influenced.
  • the steering ratio for both wheels can be influenced (the influence of both wheel positions is always the same as in a corresponding change in the rotational position of the steering wheel).
  • it is therefore not intended to be able to influence the steering angle of the inner wheel regardless of the steering angle of the outer wheel, but the influence of the steering angle should always correspond to a change in the steering ratio.
  • the superimposed transmission preferably has a single output member, which is connected exclusively to the two wheels via pivot joints and rigid connecting links (that is, for example, via tie rods and steering levers).
  • the output member comprises a working rod (tie rod), which is formed continuously from a first steering lever of the first wheel to a second steering lever of the second wheel.
  • a vehicle steering system for a vehicle provided with at least one steerable wheel has a steering handle which can be actuated by a driver, for example a steering wheel.
  • a steering wheel or a handlebar which is coupled to the steerable wheel to steer this.
  • there is a transmission ratio between a steering angle exerted on the steering handle by the driver and a pivoting angle of the steerable wheel caused by the vehicle steering which ratio varies according to a characteristic map at least as a function of the deflection of the steering handle from a straight-ahead position of the steering handle and as a function of the driving speed of the steering handle Vehicle is changeable.
  • the gear ratio remains substantially constant when both the vehicle speed in a middle speed range and the deflection of the steering handle from its straight-ahead position are within a limited range around the straight-ahead position, ie when both the vehicle speed is between a lower limit speed and an upper limit speed as well as the deflection of the steering handle from its straight-ahead position is smaller than a Grenzausschungswinkel.
  • a transmission ratio that is substantially constant in a speed range and / or a deflection angle range is understood as a transmission ratio whose magnitude does not change more than the transmission ratio of a conventional vehicle steering system in the specified speed and steering angle range (ie a vehicle steering system without a variable transmission ratio, such as, for example, a rack-and-pinion steering with regular toothing) in the same deflection angle range.
  • a transmission ratio whose magnitude does not change more than the transmission ratio of a conventional vehicle steering system in the specified speed and steering angle range (ie a vehicle steering system without a variable transmission ratio, such as, for example, a rack-and-pinion steering with regular toothing) in the same deflection angle range.
  • changes in the gear ratio of a few percent in the total usable in practice at a certain driving speed deflection angle range is still regarded as a constant gear ratio.
  • this aspect of the invention in all cases in which both the driving speed in a medium speed range between the lower limit speed and the upper Grenz ⁇ speed is as well as the deflection of the steering handle from their henceausstel ⁇ ment in a mean angular range limited by the limit deflection angle on both sides of the straight ahead position, the transmission ratio remains substantially constant.
  • the essentially constant transmission ratio in a medium speed and deflection angle range ensures that the driver is not surprised by unexpected effects of the vehicle steering in this parameter range. This improves safety when driving in the most widely used speed and deflection angle range. It is clear that this aspect of the invention also proves to be advantageous for variable ratio vehicle steering systems which are not provided with a superimposition gear which acts between a control rod and a working rod offset transversely thereto.
  • the lower limit speed may be in the range between approximately 20 and 50 km / h, in particular at approximately 30 km / h. Below this limit speed are typically with a motor vehicle driving maneuvers such. B. the parking of the driving carried on a parking lot.
  • a vehicle steering system with a highly progressive steering characteristic is advantageous, ie, a steering system which becomes increasingly more di ⁇ direct with increasing deflection of the steering handle from its straight-ahead position. In other words, this means that the transmission ratio of such a steering at large deflection angles of the steering handle is substantially greater than in the region of the straight-ahead position of the steering handle.
  • the upper limit speed a value between approximately 80 and 150 km / h has proved advantageous, in particular a value of approximately 100 km / h.
  • the upper limit speed may in particular correspond to the maximum permissible maximum speed in a particular country. This ensures that the region of essentially constant transmission ratio is left upwards only at speeds which are typically driven only on race tracks separated from public traffic.
  • the upper limit speed can be selected depending on the vehicle geometry, in particular depending on the wheelbase of the vehicle to be steered. In favor of a good straight-ahead running, it may be desirable to reduce the transmission ratio at all those speeds which are usually driven only on motorways, that is speeds of 100 km / h, for example.
  • the inventive vehicle steering allowed by their construction a simple conversion or adjustment of the limit speeds by the control for the actuator is set according to different. Elaborate mechanical conversions are unnecessary.
  • the vehicle steering system is further constructed in such a way that, outside the above-mentioned mean parameter range, changes in the transmission ratio as a function of the driving speed and / or the deflection of the steering handle are constant. This avoids abrupt changes in the gear ratio. Otherwise, such abrupt changes could surprise the driver and lead to undesirable and sometimes dangerous steering maneuvers.
  • a variable transmission ratio vehicle steering which is however constant in a medium speed and deflection range, comprises an overlaying gear provided with an actuator.
  • transmission which acts between a control component and a working component of the Len ⁇ kung.
  • the control component is movable under the influence of the steering handle and the working component is under the influence of the movement of the control component and one of these movements superimposed by the superposition gear, initiated by the actuator relative movement between the control component and the Hä ⁇ component movable, wherein the movement of the working component to the steerable wheel is transmitted to steer this.
  • the substantially constant ratio in the middle speed and deflection range is realized by the fact that when both the driving speed between the lower limit speed and the upper limit speed and the deflection of the steering handle from its straight-ahead position is smaller than the limit deflection angle, the actuator is blocked.
  • the blocking of the actuator ensures that no relative movements initiated by the actuator take place between the control component and the working component.
  • a vehicle transmission with variable transmission ratio which is constant in a medium speed and deflection range, can also be realized by other constructions of vehicle steering systems.
  • the variability of the transmission ratio as a function of the deflection of the steering handle greater than for driving speeds (especially even all speeds), which are greater than the lower limit speed.
  • the Thereforesver consent ⁇ nis in the straight ahead position of the steering handle a value between about 1: 13 and 1: 19, in particular have a value of about 1: 16, with increasing Aus ⁇ steering steering ratio increases the gear ratio and at maximum Aus ⁇ steering can reach a value between about 1: 12 and 1: 6, in particular a value of about 1: 8.
  • this speed range ie in the Maneuvering range
  • the deflection-dependent variability of the gear ratio with decreasing driving speed but advantageously over the entire maneuvering range the deflection-dependent variability is greater than the speed dependent on the vehicle speed.
  • there is substantially only deflection-dependent variability in the entire maneuvering range while the variability as a function of the driving speed in this speed range is negligibly small or absent.
  • the variability of the transmission ratio as a function of the driving speed is greater than for driving speeds (in particular even all driving speeds) which are smaller than the upper limit speed.
  • the speed-dependent variability of the transmission ratio increases with increasing driving speed.
  • the speed-dependent variability is preferably greater than the deflection-dependent variability in the entire deflection range that can be used at all at these speeds.
  • FIG. 1 is a simplified schematic representation of a vehicle steering system according to a first preferred embodiment of the invention
  • FIG. 2 shows a rack of the vehicle steering system from FIG. 1 in a simplified detail view
  • FIG. 3 is a simplified schematic detail view of a vehicle steering according to a second preferred embodiment of the invention.
  • FIG. 4 shows a part of a vehicle steering system according to a third preferred embodiment of the invention in a simplified detail view
  • FIG. 5 shows a part of a vehicle steering system according to a fourth preferred embodiment of the invention in a simplified detail view
  • 6A, B a part of a vehicle steering system according to a fifth preferred embodiment of the invention in a simplified outside view and in a cross section along the axes of symmetry of the control and the working rod.
  • the vehicle steering shown in FIG. 1 has a steering wheel 10 which is fixedly connected to a steering spindle 20. Steering movements exerted by a driver on the steering wheel 10 are transmitted via the steering shaft 20 and a steering gear 30 on a rod 40, which is hereinafter referred to as control rod 40.
  • the control rod 40 has a toothed first portion 41, in which it acts as a toothed rack 40.
  • the steering gear 30 is a rack and pinion steering gear.
  • the rotational Lenkbe ⁇ movements fed from the steering shaft 20 in the steering gear 30 are transmitted from the steering gear 30 in translational sliding movements of the control rod 40. By these sliding movements, the control rod 40 is displaced in the direction of the control rod longitudinal direction with respect to the vehicle 99.
  • the control rod 40 has a second rod section 42 with a substantially smooth surface.
  • the second rod portion 42 also referred to as connecting portion 42
  • the control rod 40 is designed as a threaded spindle 40, which cooperates with a circulating nut in the manner of a spindle-nut drive.
  • the circulating nut is rotatably mounted about a rotational axis in a transmission housing 50 of a superposition gearing relative to the gearing housing 50 and is mounted non-displaceably in the direction of the rotational axis with respect to the gearing housing 50.
  • the third Stan ⁇ genpartie 43 engages with its external thread in this corresponding internal thread of the circulating nut, so that the circulating nut and the control rod 40 cooperate in the manner of a spindle-nut drive.
  • On the gear housing 50 is further provided with an electric motor 60 provided rotary drive, by means of which the circulating nut is driven for rotation about its axis of rotation around.
  • the gear housing 50 When the rotary nut rotates about its axis of rotation, the gear housing 50 is thereby displaced with respect to the control rod 40 in the longitudinal direction of the rod due to the spindle-nut drive formed by the circulating nut and the control rod 40.
  • the gear housing 50 is fixedly connected to a tie rod 70, which is arranged offset parallel to the control rod 40 and from this transversely to the longitudinal direction of the control rod 40 (and thus also transversely to the longitudinal direction of the tie rod 70) at a distance.
  • the track rod 70 along with the gear housing 50 along the tie rod 70 (and thus along the working rod 40) with respect to the vehicle 99 is shifted when the gear housing 50 due to by the steering shaft 20 and / or the electric motor 60 initiated Lenkbe ⁇ movements with respect to the vehicle 99 is moved.
  • the sliding movements of the tie rod 70 are (not shown) via another portion of the steering linkage to two steerable vehicle wheels transmitted to guide them.
  • the electric motor 60 is controlled by a control device (not shown) and supplied with power.
  • the control device receives measurement signals from a steering spindle sensor 25 arranged on the steering spindle 20, which measures the deflection of the steering spindle 20 from its straight-ahead position and the steering moments exerted by the driver via the steering wheel 10, a speed sensor (not shown) which measures the driving speed , and a Wegaufneh ⁇ mer 90 arranged in the region of the tie rod 70, which measures the displacement of the tie rod 70 relative to the vehicle 99.
  • the control device regulates the electric current to the electric motor 60 and a servo drive 80, which supports shifting movements of the tie rod 70 with respect to the vehicle 99 in the manner of a servo drive of a conventional power steering system.
  • the control device controls the electric motor 60 in such a way that the electric motor 60 is blocked when both the driving speed is between a speed of 30 km / h and 100 km / h and the deflection of the steering wheel 10 from its straight-ahead position is smaller than 180 ° , Further, the electric motor 60 is controlled by the Steuerungsvor ⁇ direction such that for speeds below 30 km / h, the gear ratio in the straight ahead position of the steering wheel 1:16 and zu ⁇ with increasing deflection of the steering wheel 10 to a value of 1: 8 increases at maximum Auslen ⁇ effect of the steering wheel 10.
  • the electric motor 60 is controlled by the control device such that the transmission in the straight-ahead position from a value of 1:16 at 100 km / h with an increasing driving speed to a value of approximately 1:25 at the maximum driving speed.
  • the upper limit speed can be chosen instead of 100 km / h higher, for example, 130 km / h.
  • the vehicle steering system illustrated in FIG. 3 differs from the vehicle steering system illustrated in FIG. 1 in that the electric motor 160 of the rotary drive for the revolving nut 52 is not arranged on the transmission housing 50 but on the vehicle 99.
  • the electric motor 160 rotates a drive shaft 61 with respect to the vehicle 99 for rotation about its shaft axis.
  • the shaft axis of the drive shaft 61 extends parallel to the control rod 40 and to the tie rod 70.
  • the drive shaft 61 is guided through the center of a gear 54 which is rotatable about an axis of rotation of the drive shaft 61 coaxial axis of rotation and longitudinally to this axis of rotation immovable in Getriebege ⁇ housing 50 is stored.
  • the drive shaft is rotationally fixed, but slidably connected in the shaft longitudinal direction with respect to the gear 54 with the gear 54.
  • the gear 54 meshes with another gear 53 which is fixedly connected to the circulation nut 52 and is rotatable together with this around its axis of rotation.
  • a Drehantriebsgetrie ⁇ be formed by the drive shaft 61 and the two gears 53, 54, via which the electric motor 160 can drive the circulation nut 52 for rotation about its axis of rotation, wherein the housing 50 of the superposition gear mit ⁇ together with the circulation nut 52 and the Gears 53, 54 in the shaft longitudinal direction with respect to the electric motor is displaceable.
  • the vehicle steering system illustrated in FIG. 4 differs from the vehicle steering system illustrated in FIG. 3 only in that the drive shaft 161 is arranged between the control rod 40 and the tie rod 70, while in the vehicle steering system shown in FIG. 3 the control rod 40 is disposed between the drive shaft 61 and the tie rod 70. Accordingly, in the vehicle steering system shown in FIG. 4, the gear 154 connected to the drive shaft 161 is disposed between the gear 153 and the tie rod 70 connected to the race nut 52, while in the vehicle steering shown in FIG. 3, the gear 53 connected to the race nut 52 is arranged between the drive shaft 61 connected to the gear 54 and the tie rod 70.
  • the vehicle steering system illustrated in FIG. 5 differs from vehicle steering systems illustrated in the preceding figures in that the electric motor 260 of the rotary drive for the circulation nut 52 is arranged in a cavity of the tie rod 70.
  • the electric motor 260 rotates a gear 254 with respect to the tie rod 70 for rotation about an axis of rotation coincident with the longitudinal axis of the tie rod 70 and thus parallel to the axis of rotation of the barrel nut 52.
  • the gear 254 drives via a toothed belt 255 to another gear 253 which is fixedly connected to the circulation nut 52 and is rotatable together with this about its axis of rotation.
  • a rotary drive gear is formed by the toothed belt 255 and the two gears 253, 254, via which the an ⁇ in the interior of the tie rod 70 an ⁇ ordered electric motor 260 can drive the circulation nut 52 for rotation about its axis of rotation.
  • FIGS. 6A, 6B show a part of a vehicle steering system according to a fifth preferred embodiment of the invention.
  • Figure 6A shows a simplified outside view
  • Figure 6B shows a cross section along the axes of symmetry of the control and the working rod.
  • Shown is the tie rod 370 (working rod), which at their ends each have a ball joint 371, 372, by means of which it can be coupled to other elements of the steering linkage, for example to the steering lever for the two front wheels of a vehicle.
  • the tie rod 370 thus extends continuously from the steering lever of the first steerable wheel to the steering lever of the second steerable wheel.
  • a piston section 373 is further formed, which is part of a known (not shown) hydraulic servo drive for steering assistance.
  • the superposition gear is now formed within the tie rod 370. It comprises a control rod 340, which is axially displaceably mounted in a cavity of the tie rod 370 via a sliding bearing but rotatably mounted.
  • the control rod 340 comprises a rod portion 341 with a toothing, which with a (not shown) of the pinion Steering shaft can cooperate such that, depending on the rotational position of the steering spindle, the control rod 340 is moved back and forth in the axial direction.
  • a straight or a helical toothing can be selected.
  • the jacket of the working rod 370 has a through opening 374 in the corresponding section.
  • a pressing bearing which comprises spring means by means of which a radially movable sliding bearing is attached to the control rod 340.
  • the sliding bearing cooperates with the guide within the tie rod 370 and suppresses backlash between the teeth and the pinion of the steering shaft.
  • a receptacle 345 is formed for a spindle 356 of a ball screw drive.
  • the receptacle 345 is an axial bore in the control rod 340, whose inner diameter is slightly larger than the outer diameter of the spindle 356, so that the latter can be guided within the bore.
  • the ball bearing 346 is fixed. This forms a bearing for the spindle 356 on the control rod 340.
  • an electric motor 360 is housed in another cavity of the tie rod 370, near the control rod opposite end of the tie rod 370.
  • This is an elastic motor mount 361 made of steel, which surrounds the engine like a jacket and has a damping effect between the tie rod 370 and the electric motor 360. If a different damping is desired, the motor mount can also be made of another material, for example of a plastic. To increase the damping can be between the rear, the tie rod end facing the end face of the electric motor 360 and the completion of the cavity in addition an elastic disc can be used.
  • the electric motor 360 corresponds to the type disclosed in DE 102 40 704 A 1 (Tirron Elektronik GmbH) with a stator 362 with bobbins and a rotor 363 with a row of permanent magnets. On the rotor 363, the spindle 356 is non-rotatably mounted. Because the electric motor 360 can produce low speeds at high torque due to its construction, an additional transmission is unnecessary. On the control rod 340 facing the front end of the electric motor 360, a pivot bearing 364 for the spindle 356 in the cavity of the tie rod 370 is attached.
  • the operation of the in FIGS. 6A, 6B, vehicle steering system according to the fifth preferred embodiment of the invention is as follows:
  • the rotational movement of the steering shaft is transmitted via the steering gear to a steering shaft and from this via the pinion and the teeth in the rod section 341 in a translational movement the control rod 340 converted.
  • This movement is first transmitted via spindle 356 and the axially immovably attached to the tie rod 370 electric motor 360 to the tie rod 370 and from this to the other elements of the steering linkage (in particular directly to the steering lever).
  • the axial movement of the control rod 340 generated from the steering spindle can now be superimposed on a further axial movement when the spindle 356 is rotated by means of the electric motor 360 relative to the tie rod 370.
  • the piston portion 373 acts in a known manner on the steering.
  • the illustrated tie rod interact with superposition gear with an electric servo drive for steering assistance.
  • the piston portion 373 is replaced by a corresponding fitting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Power Steering Mechanism (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)

Abstract

La présente invention a trait à un système de direction automobile avec un rapport de transmission variable pour un véhicule muni d'au moins une roue orientable. Ledit système de direction comporte une timonerie de direction comprenant au moins une bielle de commande de forme allongée (40) définissant une direction longitudinale de bielle de commande, et une bielle de travail de forme allongée (70) définissant une direction longitudinale de bielle de travail. Le système de direction automobile comporte une transmission de superposition munie d'une commande d'actionnement. Ladite transmission de superposition est effective entre la bielle de direction (40) et la bielle de travail (70). La bielle de direction (40) peut se déplacer dans la direction longitudinale de bielle de direction sous l'influence d'un axe de direction (20) et d'un boîtier de direction (30). La bielle de travail (70) peut se déplacer entre la bielle de commande (40) et la bielle de travail (70) dans la direction longitudinale de la bielle de travail sous l'influence du déplacement de la bielle de commande (40) et d'un déplacement relatif initié par la commande d'actionnement superposée au moyen de la commande de superposition. Le déplacement de la bielle de travail (70) est transmis sur la roue orientable via une partie du boîtier de direction, et donc oriente la roue. La transmission de superposition comporte un écrou en interaction avec celle-ci à la manière d'un entraînement axe/écrou. Une première section d'engrenages d'une paire définie par l'axe et l'écrou est reliée à une première bielle d'une paire de bielles définie par la bielle de commande et la bielle de travail. La deuxième section d'engrenages de la paire d'engrenages est montée sur la deuxième bielle de manière à être entraînée en rotation par rapport à la deuxième bielle de la paire de bielle. La commande d'actionnement est adaptée et montée en vue d'entraîner la deuxième partie d'engrenages en rotation par rapport à la deuxième bielle.
EP05782616A 2004-09-17 2005-09-16 Systeme de direction automobile Not-in-force EP1789305B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05782616A EP1789305B1 (fr) 2004-09-17 2005-09-16 Systeme de direction automobile

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04405596A EP1637436A1 (fr) 2004-09-17 2004-09-17 Dispositif de direction pour véhicule
EP05782616A EP1789305B1 (fr) 2004-09-17 2005-09-16 Systeme de direction automobile
PCT/CH2005/000548 WO2006029547A1 (fr) 2004-09-17 2005-09-16 Systeme de direction automobile

Publications (2)

Publication Number Publication Date
EP1789305A1 true EP1789305A1 (fr) 2007-05-30
EP1789305B1 EP1789305B1 (fr) 2010-06-23

Family

ID=34932290

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04405596A Withdrawn EP1637436A1 (fr) 2004-09-17 2004-09-17 Dispositif de direction pour véhicule
EP05782616A Not-in-force EP1789305B1 (fr) 2004-09-17 2005-09-16 Systeme de direction automobile

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04405596A Withdrawn EP1637436A1 (fr) 2004-09-17 2004-09-17 Dispositif de direction pour véhicule

Country Status (6)

Country Link
US (1) US20070251756A1 (fr)
EP (2) EP1637436A1 (fr)
JP (1) JP5179872B2 (fr)
AT (1) ATE471861T1 (fr)
DE (1) DE502005009804D1 (fr)
WO (1) WO2006029547A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200164912A1 (en) * 2017-05-12 2020-05-28 Trw Automotive Us Llc Apparatus for use in turning steerable vehicle wheels
DE102019107577A1 (de) * 2019-03-25 2020-10-01 Zf Automotive Germany Gmbh Steer-by-Wire Lenksystem

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Also Published As

Publication number Publication date
EP1637436A1 (fr) 2006-03-22
EP1789305B1 (fr) 2010-06-23
US20070251756A1 (en) 2007-11-01
DE502005009804D1 (de) 2010-08-05
JP5179872B2 (ja) 2013-04-10
WO2006029547A1 (fr) 2006-03-23
ATE471861T1 (de) 2010-07-15
JP2008513263A (ja) 2008-05-01

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